Harry F. Gerguson (born Hershel Geguzin, February 20, 1890 – September 1, 1971), known as Michael Romanoff, was a Hollywood restaurateur, con man and actor born in Lithuania. He is perhaps best remembered as the owner of the now-defunct Romanoff's, a Beverly Hills restaurant popular with Hollywood stars in the 1940s and 1950s.

He claimed to be a member of Russia's royal House of Romanov (sometimes spelled "Romanoff" in English). This was widely known to be untrue throughout his career, but press reports tended to treat the deception as a humorous matter.